Democrats appear hopeful that Trump's histrionics and harsh tongue will convince their voters to come out and vote in large numbers this time and ensure a victory for their candidates to control both houses.

Dozens of volunteers wearing rainbow flag wristbands emblazoned with Pelosi's name called and texted voters in competitive districts in California and around the country, urging them to get to the polls.

"Everything matters and everything's at stake", Schriock said. That result, considered less likely even within the White House, would embolden the president as he launches his own re-election bid.

If Democrats win back the House, she said, they'll be able to "say, 'okay, take a deep breath, calm this rhetoric down, ' because it has no place in a democracy", she added.

"It's all fragile. Everything I told you about, it can be undone and changed by the Democrats if they get in", Trump told supporters Monday during a telephone "town hall" organized by his re-election campaign. "It's all fragile", he said.

Not to mention he has never hesitated to throw an ally under the bus, says Doug Heye, the former communications director for the RNC. "The people are sort of holding for Tuesday", Trump said after asking the audience whether they'd already voted.

Trump has faced threats of impeachment over his conduct in relation to the FBI investigation into Russian meddling in the 2016 election. But the marquee event in this hour is the West Virginia Senate race, where incumbent Democrat Joe Manchin, who voted in favor of confirming Brett Kavanaugh to the Supreme Court, is expected to hold on.

The political realignment, if it solidifies, could reshape U.S. politics for a generation. "I just love the deregulation and I just want to keep everything moving, because I'm loving it". There are now 236 Republicans, 193 Democrats and six vacancies.

A nationwide poll released Sunday by NBC News and The Wall Street Journal details the depth of the demographic shifts. He is bombarding the voters with tweets and speeches that make out the caravan as a bunch of criminals who threaten the safety of the United States, with particular emphasis on the welfare of women.

Something else will happen if Republicans lose big on Tuesday: Their ranks in Congress will get smaller - but also white, older, more male and much more conservative.

"The survival of the country is going to depend on this election", he said as another man stopped for a moment to argue.

Election workers Mark Bezanson, left, and Julie Olson dump ballots collected earlier in the day from drop boxes onto a table for sorting at the King County Elections office, Monday, November 5, 2018, in Renton, Washington. "But it'll be a start".

Trump is also hammering away at the anxieties of women voters. Panelo, the son of a Mexican immigrant, said migrants shouldn't be demonised, but he stopped short of criticising the president, and plans to vote for Republican candidates who could help push Trump's agenda.

Still, his xenophobic rhetoric has been unprecedented for an American president in the modern era: "Barbed wire used properly can be a attractive sight", Trump told voters in Montana.

With that in mind, unusually high voter turnout could be a good sign for them.

The outcome is clouded by the dramatically different landscape between the House and Senate.

Democrats feel increasingly optimistic about their chances of taking back control of the House.

A number of prominent anti-Trump Democrats also would be poised to assume control of key committees if Republicans lose control of the House.

He said that shows how "warped" some voters are in their thought.

As a result, Bloomberg's team poured money into otherwise overlooked suburban districts in states like Georgia, Washington state and Oklahoma because data revealed voters there were better-educated.

'There are so many people in the House, ' Trump vented Sunday, saying he had focused his efforts on the Senate, in a move observers took as a step at managing expectations and avoiding blame.

However, political science professor Ryan Hurl believes it would be "dangerous" for the Democrats to impeach Trump if the charges are spurious.

Both parties have a chance, if only a slim one, for an upset in the respective chambers where they're playing as underdogs.

For Democrats the reasons for showing up are obvious.

Liberal activist Tom Steyer spent roughly US$120 million this midterm season. Either of the latter two scenarios would be problematic for Trump, immediately putting a damper on his agenda.

Steyer insisted most Democrats agree. "We can even include some surprising Democratic wins". "It's an awakening of the Democratic Party".

According to Michael McDonald of the US Elections Project, 38.4 million Americans cast their ballots early this time compared with 27.4 million in the 2014 midterm.